Radioactive yellow III

Freight containers with capacities of less than 640 cubic feet need not be placarded when containing hazardous materials if the container is labeled in accordance with Subpart E of Part 172 and the mode of transpK)rtation is other than by air. When air transportation is involved, such containers must be placarded with one placard, unless the container is labeled in accordance with Section 172.406(e)(3), or contains radioactive materials requiring the RADIOACTIVE YELLOW-III label and is placarded with one RADIOACTIVE placard and is labeled in accordance with Section 172.406(e). 

A RADIOACTIVE YELLOW-HI label must be affixed to each package which measures more than 50 millirem per hour at each point or exceeds 1.0 millirem per hour at three feet from each point on the external surface, is a Fissile Class III, or contains a large quantity of radioactive material as defined in Section 173.389 of the regulations. ... 

Figure App. 3.9 Radioactive substances warning labels, a Radioactive group I. Colors I black symbol and lettering on white background the numeral I, the superimposed vertical bar, is red. b and c, respectively, II and III black symbol on yellow background, black lettering in white background, numerals II and III are red.

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